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d in (-oo:+oo)
(5/4)*d = 1-15 // - 1-15
(5/4)*d-1+15 = 0
5/4*d+14 = 0 // - 14
5/4*d = -14 // : 5/4
d = -14/5/4
d = -56/5
d = -56/5
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